Gas flow issue in ammonia decomposer
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Our factory installed a new ammonia decomposition furnace the year before last. This year, we encountered a problem that has yet to be resolved; we can only keep it running barely by making do, and we are seeking help from experts~~~ The flow rate of the ammonia decomposition furnace keeps fluctuating greatly – for example, when the set flow rate is 250, it can vary by around 1000 units, which severely affects the proper operation of the furnace. I began to suspect there was a problem with the gauge, but an inspection of it showed that it was working fine. Finally, the gas booster was checked again; it was suspected that there was a problem with the check valve. After removing it, the fluctuations persisted, so one side was purged, which reduced the fluctuations, but the issue wasn’t completely resolved. This is the only option for now; please explain. Also, the fluctuations are smaller when the set value is high, and larger when it is low.
In my opinion, it’s possible that the catalyst has melted or ammonium salts have accumulated, resulting in high resistance in the catalyst. Try opening the vents before and after the preheater; if the situation improves when the vent is opened before the preheater, it indicates that there is no problem with the catalyst in the furnace, and the issue lies in the subsequent processes. If the situation does not improve when the vent is opened after the preheater, then there is a problem with the preheater itself; otherwise, the issue lies in the pipes of the subsequent system.
Thank you for that. Could you please explain in more detail whether the preheater refers to the one related to gas, or something else? Also, it seems that we have checked all the subsequent pipelines and found them to be in good condition
Well, this is indeed related to coking; it’s just the subsequent treatment process. Here, the ammonia gas is directly decomposed and dispersed, and this method is used for that purpose
This post was last edited by hanniba71 on 2012-8-15 22:45. A preheater for air or gas that uses the exhaust gases from ammonia decomposition to preheat air or gas
In our process, there is no preheater stage; after pressurization, the material goes straight into the decomposition tower
We just replaced both the catalyst and the inert balls this time, and it hasn’t been even 3 months yet; so melting occurring at this point is a bit hard to explain. I guess there might be some issue with subsequent gas release, but we haven’t checked that aspect yet